Thread: Water temp spiking on hills...what to look for

ok so we are not talking a 20-30c temp change, just 10c when working hard, towing, up hill.....whats to say this isnt normal??

Im pretty confident my truck is in good working order. I did 2 runs to toowoomba the last few weeks. It sits on about 85c and when going up "the Range" it would get to 92c, no load

maybe we are just use to the OEM LR gauge, that is painted on

105degrees and climbing up cunningham gap.

I'm not overly worried, just never seen it move around like this.

Bigass driving lights blocking air flow ???

You wouldn't by any chance have some great big spotlights and /or a winch in front of the grille?
Regards Philip A

Originally Posted by weeds

Oh heater matrix is already bypassed

IME you need the heater there to give you that little extra cooling capacity, the coolant flows through it all the time, there isn't a valve which turns the flow on and off, only a flap which directs air through the core and into the cabin.
When I by-passed mine it ran a few degrees warmer straight away.

Originally Posted by pop058

Bigass driving lights blocking air flow ???

Originally Posted by PhilipA

You wouldn't by any chance have some great big spotlights and /or a winch in front of the grille?
Regards Philip A

Doesn't seem to make much difference fitted or removed on 300Tdi Deefer.

The air con condenser on the other hand.....

Kelvin,

the rads in these are too small anyway, so anything approaching 20% blockage will cause these symptoms when working hard, even in this cool climate.

JC

Kelvin, my first thought is the viscous clutch too.

I know years ago another Aussie on the old LRE board had a problem with his 300Tdi Deefer o/heating on hills @ 100km/h, someone suggested the fan clutch and I said no way, ram air should be sufficient at that speed.

Guess what, it was the fan clutch.

Defenders have shocking air flow through the engine bay.

If it's original and your upwards of 250,000km now, it might be an idea to replace.
I think I'm on my second or third, I tend to replace them on age as you can't service them like a Nissota.